drm/amd/display: Add inbox0 HW lock helpers for DCN35

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Add dcn35_dmub_hw_control_lock() and dcn35_dmub_hw_control_lock_fast(),
a SW lock mechanism to prevent racing between driver and FW.

The helpers are not wired into dcn35_funcs/dcn351_funcs yet, so there is
no functional change: DCN3.5/3.5.1/3.6 keep using the existing inbox1
lock path. Enabling them will come in a follow-up patch.

Reviewed-by: Ray Wu <ray.wu@amd.com>
Signed-off-by: Tom Chung <chiahsuan.chung@amd.com>
Signed-off-by: Chenyu Chen <chen-yu.chen@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Tom Chung 2026-02-02 16:06:40 +08:00 • committed by Alex Deucher

parent 0575f53925

commit c615f0715b

2 changed files with 47 additions and 0 deletions

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43

drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.c

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4

drivers/gpu/drm/amd/display/dc/hwss/dcn35/dcn35_hwseq.h

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